photopathyn.
/fəʊˈtɒpəθi/, U.S. /ˌfoʊˈtɑpəθi/ Biology. rare.
Originally: the tendency of an organism to move either into or away from regions of relatively intense illumination (as distinct from a response specifically to the direction of the light rays). In later use: a tendency to move out of more brightly lit areas (negative phototaxis); intolerance of light.
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the world > life > biology > biological processes > movement > movement in response to stimuli > [noun] > response to light
phototaxis1893
photopathy1897
heliotaxis1898
phototropism1899
photokinesis1905
photonegativity1921
photostability1926
photophily1934
1897 C. B. Davenport Exper. Morphol. i. 180 Control of the Direction of Locomotion by Light—Phototaxis and Photopathy. [Note.] The second includes the wandering of organisms into a more or less intensely illuminated region.
1940 Chambers's Techn. Dict. 639/1 Photopathy, negative phototaxis.
1965 B. E. Freeman tr. A. Vandel Biospeleol. xxv. 400 Negative phototropism is more complex. It is an adaptive reaction designed to remove the animal from an unpleasant stimulus... This type of reaction was named photopathy by Graber (1884).
1986 Indian Jrnl. Zool. 14 i. 20/2 Troglobite Coleoptera..do not tolerate Light excitation very well... It is an avoiding reaction (photopathy).
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1897